Control circuit arrangement

(19)

(11)

EP 0 711 107 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	11.06.1997 Bulletin 1997/24

(43)	Date of publication A2:
	08.05.1996 Bulletin 1996/19

(21)	Application number: 95850186.8

(22)	Date of filing: 07.11.1995

(51)	International Patent Classification (IPC)⁶: H05K 7/20, H05K 7/14

(84)	Designated Contracting States:
	DE DK FR GB IT

(30)

Priority:

07.11.1994 SE 19940003802

(71)	Applicant: ATLAS COPCO CONTROLS AB, TYRESÖ
	S-135 26 Tyresö (SE)

(72)	Inventor:
	Karlsson, Ulf Bengt Ingemar S-135 41 Tyresö (SE)

(74)	Representative: Pantzar, Tord
	Atlas Copco Tools AB Patent Department S-105 23 Stockholm S-105 23 Stockholm (SE)

(54)	Control circuit arrangement

(57) A control circuit arrangement for an electric motor drive unit comprises a circuit board (10), a heat conductive substrate (12) carrying power semi-conductors (13), a heat absorbing mounting structure (14) disposed in a heat transferring contact with the heat conductive substrate (12) and a clamping means (20) for clamping the circuit board (10) and the heat conductive substrate (12) to the mounting structure (14), and a number of electrically conductive distance tube elements (22) disposed between the circuit board (10) and the heat conductive substrate (12) for distributing the clamping force of the clamping means (20) from the circuit board (10) to the heat conductive substrate (12) while forming electrical leads between the circuit board (10) and the heat conductive substrate (12).

Search report